小型槽式太阳能集热器优化设计与试验研究

Optimum design and experimental study of small parabolic trough solar receiversmall trough type solar collector

按照高性能低成本的原则设计并制作了集热面积为12 m^2的商用小型槽式集热器。其主要创新优化之处包括：1通过免背板设计减少了槽式反射镜面结构的重量和用材,提高了镜面曲率精度;2通过推杆联动机构减少了驱动装置;3反射镜面板分离式结构起到了自清洁功能,减轻了清扫的工作强度;4将闭环反馈技术应用到太阳能跟踪控制系统,可实现四季全天候跟踪。现场试验结果表明：在太阳辐射强度为540～660 W/m^2时,该集热器可将循环水加热至170℃以上,系统整体集热效率最高可达0.52,但随水温的升高逐渐降低。

According to the principle of high performance and low cost, a small l trough type solar collector small parabolic trough solar receiverwas designed and madedeveloped for market,which collecting sunlight area is 12 m^2.Its the main optimization points including： 1 The free backplane design reduces the trough reflector structuretheweight and materialsof the trough reflector structureand improve the precisionthe reflector surface accuracy. 2The push rod linkage mechanism of push rod linkagereduces thenumber ofdriving devices. 3 The separation type structure of reflector panel plays a self-cleaning function and reduces the intensity of manual cleaning. 4The closed loop feedback technology is applied to the solar tracking control systemso that it can work all year.When solar radiation intensity is 540 ～660 W/m^2,the experiment results show： circulating water can be heated to more than 170 degrees and the heat collecting efficiency is up to 0.52, but decreases with temperature of water increasing.